1910795 - Janky mouse and cursor performance on 404media.co subscribe overlay

Status: NEW

(Core :: Graphics: WebRender, defect)

Description

[Mike]

Attachment: about-support-firefox.txt

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/115.0

Steps to reproduce:

Visit https://404media.com. Click the Subscribe button.

Actual results:

The signup overlay is displayed. Mouse movements are janky and skip around. Typing text in input boxes has tremendous lag.

performance report: https://share.firefox.dev/3StVlrc

Expected results:

Smoother mouse and less lag on text input. Tested on Chromium and performance is much better. Tested on Firefox 128.0.3 same result. Disabled hardware acceleration in the settings/performance fixes issue for the site. However, other sites are slower as a result.

Comment 1

[Mayank Bansal]

1. The about:support you shared seems to be captured after you have manually disabled hardware acceleration. Can you enable hardware acceleration and then capture about:support? Also capture the performance profile with hardware acceleration enabled.
2. With Hardware acceleration enabled, set layout.css.backdrop-filter.enabled=False , restart the browser and then test the page. Is the issue fixed for you?

Comment 2

[Mike]

Attachment: about-support-firefox-2.txt

Comment 3

[Mike]

Updated about:support uploaded. Sorry about that.

I changed the layout.css.backdrop-filter.enabled to false, restarted the browser, and then tested the page again. It did seem to fix it.

Comment 4

[Mayank Bansal]

Thanks for checking!

Comment 5

[Glenn Watson [:gw]]

From a quick look at the profile, it appears to be spending a huge amount of time inside the driver code. Marked as S3 since it's a very old GPU.